sensorhandler: changed mutabiltity error code in get sensor

Changed mutability handling error code in get sensor
from IPMI_CC_SENSOR_INVALID to IPMI_CC_ILLEGAL_COMMAND

Change-Id: I599de08e3d3bc6a9820ac3978f0a4d160f19f55e
Signed-off-by: Jayanth Othayoth <ojayanth@in.ibm.com>
1 file changed